scholarly journals Endogenous Bud and Root Formation by Isolated Roots of Convolvulus Grown in Vitro.

1958 ◽  
Vol 33 (4) ◽  
pp. 258-263 ◽  
Author(s):  
John G. Torrey
Keyword(s):  
Root Formation ◽  
Isolated Roots

In Vitro Root Formation in Anacardium Occidentale Microshoots

2001 ◽  
Vol 44 (2) ◽  
pp. 175-179 ◽  
Author(s):  
B. Boggetti ◽  
J. Jasik ◽  
S.H. Mantell
Keyword(s):  
Root Formation ◽  
Anacardium Occidentale

Floral induction in date palm seedlings (Phoenix dactylifera var. Deglet Nour) cultured in vitro

1987 ◽  
Vol 65 (1) ◽  
pp. 137-142 ◽  
Author(s):  
Saïda Ammar ◽  
Abdellatif Benbadis ◽  
Bal Krishna Tripathi
Keyword(s):  
Date Palm ◽  
Root Formation ◽  
Early Stage ◽  
Floral Induction ◽  
Phoenix Dactylifera ◽  
Flower Bud ◽  
Precocious Flowering ◽  
Cultural Conditions ◽  
Bud Initiation

Flower bud initiation in 5-month-old seedlings of date palm (Phoenix dactylifera L. var. Deglet Nour) was studied under controlled conditions. Normally inflorescence formation in mature plants takes 8 to 10 years. In juvenile plants inflorescence formation was induced in a 16-h day at 28 °C, by a combination of 6-benzylaminopurine, indoleacetic acid, and glucose or sucrose. The present investigation has determined favourable cultural conditions for floral induction in date palm in vitro at a very early stage of ontogeny. Both male and female flowers were induced on young plants. Floral induction usually occurred only when root formation was completely inhibited. The apparent antagonism between root formation and floral development suggests a possible competition in the young plant for growth substances, although production of floral inhibitory substances from the root cannot be precluded. These observations on the induction of precocious flowering in date palm seedlings suggest a model of development, corresponding to neoteny, of this tree as an herb.

scholarly journals Rhizogenesis in in vitro shoot cultures of passion fruit (Passiflora edulis f. flavicarpa Deg.) is affected by ethylene precursor and by inhibitors

2001 ◽  
Vol 7 (1) ◽  
Author(s):  
W. M. Marota ◽  
W. C. Otoni ◽  
M. Carnelossi ◽  
E. Silva ◽  
A. A. Azevedo ◽  
...  
Keyword(s):  
Ethylene Production ◽  
Time Course ◽  
Root Formation ◽  
Callus Formation ◽  
Passion Fruit ◽  
Shoot Cultures ◽  
Ethylene Inhibitors ◽  
Beneficial Effects ◽  
Ethylene Precursor

The effects of the ethylene precursor ACC and two inhibitors, AgNO3 and AVG, on root formation were tested in in vitro shoots of passion fruit (Passiflora Midis f.flavicalpa Deg.). The organogenic response was assessed on the basis of percentage of shoot-forming. roots, root number and length. The time course of ethylene production was also monitored. ACC inhibited root formation by delaying root emergence and increasine, callus formation at the basis of the shoots. In addition, ACC caused a marked increase in ethylene production, coupled to leaf chlorosis and senescence with lower rooting frequencies, number and length of roots. IAA supplementation increased ethylene production. Both ethylene inhibitors, AgNO3 and AVG, at appropriate concentrations reduced callus formation at the basis of shoots. AVG increased the number of roots per shoot, but drastically reduced length of differentiated roots. Regarding to leaf pigments, ACC promoted a marked reduction on carotenoids and total chlorophyll, whereas AVG and AgNO3 delayed explant senescence and pigments degradation, not differing from IAA supplemented and non-supplemented control treatments. The results confirm previous reports on the beneficial effects of ethylene inhibitors on in vitro rooting and suggest its reliability to be used as an alternative approach to evaluate sensitivity of Passiflora species to ethylene.  

scholarly journals In vitro regeneration performance of Corchorus olitorius

1970 ◽  
Vol 8 (1) ◽  
pp. 1-6 ◽  
Author(s):  
M Hoque ◽  
KM Nasiruddin ◽  
GKMN Haque ◽  
GC Biswas
Keyword(s):  
Shoot Regeneration ◽  
Callus Induction ◽  
Root Formation ◽  
Plantlet Regeneration ◽  
Ms Medium ◽  
Corchorus Olitorius ◽  
The Media ◽  
Regenerated Plantlets

The experiment was conducted during May to December 2008 in the Biotechnology Laboratory of Bangladesh Agricultural University, Mymensingh to observe the callus induction, regeneration potentiality and to establish a suitable in vitro plantlet regeneration protocol of Corchorus olitorius. MS medium supplemented with different phytohormone concentrations and combinations were used to observe the callus induction, shoot regeneration and root formation ability of the cotyledon with attached petiole derived explant of three genotypes viz. O-9897, O-72 and OM-1. The highest callus induction (92.85%) was observed in O-9897 followed by O-72 (82.14%) in the MS media supplemented with 2.5 mg/L BAP + 0.5 mg/L IAA. Genotype O-9897 in MS media supplemented with 2.5 mg/L BAP + 0.5 mg/L IAA produced the highest percentage of shoot regenerants (83.33%) followed by O-72 (75.00%) in the media supplemented with 2.5 mg/L BAP + 0.5 mg/L IAA. The root formation from regenerants was the best on halfstrength of MS media supplemented with 0.6 mg/L IBA in genotype O-9897 (45.00%). The in vitro regenerated plantlets from the genotypes O-9897 could be established in the field. Therefore, the genotypes O-9897 of C. olitorius in MS media supplemented with 2.5 mg/L BAP + 0.5 mg/L IAA could be used for callus induction and shoot regeneration. Keywords: Regeneration; Phytohormone; Corchorus olitorius DOI: 10.3329/jbau.v8i1.6390J. Bangladesh Agril. Univ. 8(1): 1-6, 2010

scholarly journals Peculiarities of in vitro rooting of some species of Carlina L. genus

1970 ◽  
pp. 215-220
Author(s):  
N. B. Kravets ◽  
M. Z. Mosula ◽  
N. M. Drobyk ◽  
N. V. Tulaidan ◽  
M. B. Cheterbok
Keyword(s):  
Acid Solution ◽  
Growth Regulators ◽  
Root Formation ◽  
Cultivated Plants ◽  
Treat Ment ◽  
Presowing Treatment ◽  
Murashige Skoog ◽  
Half Strength ◽  
Semi Solid

Aim. The aim of the study was to choose conditions for rooting improvement of in vitro cultivated plants of some species of Carlina L. genus. Methods. For receiving and rooting of aseptic sprouts, seeds of Carlina acaulis L., Carlina cirsioides Klok and Carlina onopordifolia Besser ex Szafer, Kulcz. et Pawl were subjected to presowing treatment with gibberellic acid solution (GA3) or indolebyturic acid solution (IBA). Sterilized seeds were planted in sterile Petri dishes on semi-solid Murashige, Skoog nutrient medium with half-strength concentrations of macro- and microsalts without growth regulators. Results. It was found that with the seed soaking of C. acaulis, C. cirsioides and C. onopordifolia in GA3 solution the percentage of root formation amounted to 33.3 %, 33.3 % and 22.2 % respectively. Presowing treat-ment of carlina seeds in IBA solution with concentration of 1000 mg for 2–4 hours before sterilization gave a positive effect: the percentage of root formation for C. acaulis, C. cirsioides and C. onorordifolia was 2.4–4.5 times higher compared to the treatment with GA3 solution. Conclusions. To form the root system of carlina plants it is effective to soak the seeds in the solution of IBA. Thus we were able to increase the percentage of rooting of C. sirsioides and C. onorordifolia plants to 100 %, C. acaulis plants – up to 80 % and avoid sprouts’ injury and changes in the concentra-tions of the IBA, which may occur during sterilization at high temperatures by using non-sterile solution of growth regulators. Keywords: Carlina àcaulis L., Carlina cirsioides Klok, Carlina onopordifolia Besser ex Szafer, Kulcz. et Pawl, in vitro, sprouts rooting.

Evidence for Auxin Production in Isolated Roots Growing In vitro

1939 ◽  
Vol 101 (2) ◽  
pp. 450-456 ◽  
Author(s):  
J. van Overbeek
Keyword(s):  
Auxin Production ◽  
Isolated Roots

scholarly journals Paxillus involutus Forms an Ectomycorrhizal Symbiosis and Enhances Survival of PtCOMT-modified Betula pendula in vitro

2008 ◽  
Vol 57 (1-6) ◽  
pp. 235-242 ◽  
Author(s):  
H. Tiimonen ◽  
T. Aronen ◽  
T. Laakso ◽  
P. Saranpää ◽  
V. Chiang ◽  
...  
Keyword(s):  
Populus Tremuloides ◽  
Betula Pendula ◽  
Root Formation ◽  
Lateral Roots ◽  
Cauliflower Mosaic Virus ◽  
35S Promoter ◽  
Paxillus Involutus ◽  
Transgenic Lines ◽  
G Ratio

Abstract The ability of the PtCOMT (caffeate/5-hydroxyferulate O-methyltransferase from Populus tremuloides L.) - modified Betula pendula Roth. lines to form symbiosis with an ectomycorrhizal (ECM) fungus Paxillus involutus Batsch Fr. was studied in vitro. Lignin precursor gene PtCOMT was introduced into two B. pendula clones under the control of the cauliflower mosaic virus 35S promoter or the promoter of the sunflower polyubiquitin gene UbB1. Of the four transgenic lines, one 35SPtCOMT line (23) had a decreased syringyl/guaiacyl (S/G) ratio of root lignin, and two UbB1-PtCOMT lines (110 and 130) retarded root growth compared to the control clone. Both control clones and all transgenic lines were able to form ECMs with P. involutus, but the transgenic lines differed from the controls in the characteristics of the ECMs. The number of lateral roots covered with fungal hyphae and/or development of a Hartig net (HN) were reduced in line 23 with a decreased S/G ratio, and in lines 110 and 130 with slower root formation and changed root morphology, respectively. However, line 23 benefited more from the inoculation in lateral root formation than the control, and in lines 110 and 130 the percentage of viable plants increased most due to inoculation. The results show that B. pendula plants genetically transformed with the lignin gene PtCOMT could form mycorrhizal symbiosis regardless of changes in either the root S/G ratio or development. The benefits of the symbiosis were variable even in the closed in vitro system, and dependent on the clone or transgenic line and the ECM fungal symbiont.

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